*Since “10 Mind Blowing Mathematical Equations” is one of my most successful articles to date, I decided to write another math list.*

Plenty of things in math are downright uninteresting. Who cares that the area of a circle is **πr²**, or that a negative times a negative is a positive? Why should this interest us at all? Perhaps the answer can be found in the most unexpected results, the counterintuitive facts that have sometimes eluded even the best mathematicians.

**1. Birthday Paradox**

The birthday paradox says that if there are 23 people in a room, there is a more than 50% chance that two people have the same birthday. It seems counterintuitive because the probability of having a birthday on any particular day is only 1/365.

But the difference relies on the fact that we only need two people to have the same birthday as **each other**

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